105436638acc7c010349a69c3395f1a57c642dc62Ying Wang# setenv.m4 serial 26 205436638acc7c010349a69c3395f1a57c642dc62Ying Wangdnl Copyright (C) 2001-2004, 2006-2012 Free Software Foundation, Inc. 305436638acc7c010349a69c3395f1a57c642dc62Ying Wangdnl This file is free software; the Free Software Foundation 405436638acc7c010349a69c3395f1a57c642dc62Ying Wangdnl gives unlimited permission to copy and/or distribute it, 505436638acc7c010349a69c3395f1a57c642dc62Ying Wangdnl with or without modifications, as long as this notice is preserved. 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 705436638acc7c010349a69c3395f1a57c642dc62Ying WangAC_DEFUN([gl_FUNC_SETENV], 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang[ 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([gl_FUNC_SETENV_SEPARATE]) 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang if test $ac_cv_func_setenv = no; then 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang HAVE_SETENV=0 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CACHE_CHECK([whether setenv validates arguments], 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang [gl_cv_func_setenv_works], 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang #include <stdlib.h> 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang #include <errno.h> 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang #include <string.h> 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang ]], [[ 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang int result = 0; 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (setenv ("", "", 0) != -1) 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang result |= 1; 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang else if (errno != EINVAL) 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang result |= 2; 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (setenv ("a", "=", 1) != 0) 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wang result |= 4; 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wang else if (strcmp (getenv ("a"), "=") != 0) 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang result |= 8; 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wang return result; 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang ]])], 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wang [gl_cv_func_setenv_works=yes], [gl_cv_func_setenv_works=no], 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wang [case "$host_os" in 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang # Guess yes on glibc systems. 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wang *-gnu*) gl_cv_func_setenv_works="guessing yes" ;; 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wang # If we don't know, assume the worst. 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang *) gl_cv_func_setenv_works="guessing no" ;; 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang esac 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang ])]) 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang case "$gl_cv_func_setenv_works" in 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang *yes) ;; 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang *) 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang REPLACE_SETENV=1 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang ;; 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang esac 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang fi 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang]) 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang# Like gl_FUNC_SETENV, except prepare for separate compilation 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang# (no REPLACE_SETENV, no AC_LIBOBJ). 5505436638acc7c010349a69c3395f1a57c642dc62Ying WangAC_DEFUN([gl_FUNC_SETENV_SEPARATE], 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang[ 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_DECLS_ONCE([setenv]) 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang if test $ac_cv_have_decl_setenv = no; then 6005436638acc7c010349a69c3395f1a57c642dc62Ying Wang HAVE_DECL_SETENV=0 6105436638acc7c010349a69c3395f1a57c642dc62Ying Wang fi 6205436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_FUNCS_ONCE([setenv]) 6305436638acc7c010349a69c3395f1a57c642dc62Ying Wang gl_PREREQ_SETENV 6405436638acc7c010349a69c3395f1a57c642dc62Ying Wang]) 6505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6605436638acc7c010349a69c3395f1a57c642dc62Ying WangAC_DEFUN([gl_FUNC_UNSETENV], 6705436638acc7c010349a69c3395f1a57c642dc62Ying Wang[ 6805436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([gl_STDLIB_H_DEFAULTS]) 6905436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles 7005436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_DECLS_ONCE([unsetenv]) 7105436638acc7c010349a69c3395f1a57c642dc62Ying Wang if test $ac_cv_have_decl_unsetenv = no; then 7205436638acc7c010349a69c3395f1a57c642dc62Ying Wang HAVE_DECL_UNSETENV=0 7305436638acc7c010349a69c3395f1a57c642dc62Ying Wang fi 7405436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_FUNCS([unsetenv]) 7505436638acc7c010349a69c3395f1a57c642dc62Ying Wang if test $ac_cv_func_unsetenv = no; then 7605436638acc7c010349a69c3395f1a57c642dc62Ying Wang HAVE_UNSETENV=0 7705436638acc7c010349a69c3395f1a57c642dc62Ying Wang else 7805436638acc7c010349a69c3395f1a57c642dc62Ying Wang HAVE_UNSETENV=1 7905436638acc7c010349a69c3395f1a57c642dc62Ying Wang dnl Some BSDs return void, failing to do error checking. 8005436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CACHE_CHECK([for unsetenv() return type], [gt_cv_func_unsetenv_ret], 8105436638acc7c010349a69c3395f1a57c642dc62Ying Wang [AC_COMPILE_IFELSE( 8205436638acc7c010349a69c3395f1a57c642dc62Ying Wang [AC_LANG_PROGRAM( 8305436638acc7c010349a69c3395f1a57c642dc62Ying Wang [[ 8405436638acc7c010349a69c3395f1a57c642dc62Ying Wang#undef _BSD 8505436638acc7c010349a69c3395f1a57c642dc62Ying Wang#define _BSD 1 /* unhide unsetenv declaration in OSF/1 5.1 <stdlib.h> */ 8605436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <stdlib.h> 8705436638acc7c010349a69c3395f1a57c642dc62Ying Wangextern 8805436638acc7c010349a69c3395f1a57c642dc62Ying Wang#ifdef __cplusplus 8905436638acc7c010349a69c3395f1a57c642dc62Ying Wang"C" 9005436638acc7c010349a69c3395f1a57c642dc62Ying Wang#endif 9105436638acc7c010349a69c3395f1a57c642dc62Ying Wangint unsetenv (const char *name); 9205436638acc7c010349a69c3395f1a57c642dc62Ying Wang ]], 9305436638acc7c010349a69c3395f1a57c642dc62Ying Wang [[]])], 9405436638acc7c010349a69c3395f1a57c642dc62Ying Wang [gt_cv_func_unsetenv_ret='int'], 9505436638acc7c010349a69c3395f1a57c642dc62Ying Wang [gt_cv_func_unsetenv_ret='void'])]) 9605436638acc7c010349a69c3395f1a57c642dc62Ying Wang if test $gt_cv_func_unsetenv_ret = 'void'; then 9705436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_DEFINE([VOID_UNSETENV], [1], [Define to 1 if unsetenv returns void 9805436638acc7c010349a69c3395f1a57c642dc62Ying Wang instead of int.]) 9905436638acc7c010349a69c3395f1a57c642dc62Ying Wang REPLACE_UNSETENV=1 10005436638acc7c010349a69c3395f1a57c642dc62Ying Wang fi 10105436638acc7c010349a69c3395f1a57c642dc62Ying Wang 10205436638acc7c010349a69c3395f1a57c642dc62Ying Wang dnl Solaris 10 unsetenv does not remove all copies of a name. 10305436638acc7c010349a69c3395f1a57c642dc62Ying Wang dnl Haiku alpha 2 unsetenv gets confused by assignment to environ. 10405436638acc7c010349a69c3395f1a57c642dc62Ying Wang dnl OpenBSD 4.7 unsetenv("") does not fail. 10505436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CACHE_CHECK([whether unsetenv obeys POSIX], 10605436638acc7c010349a69c3395f1a57c642dc62Ying Wang [gl_cv_func_unsetenv_works], 10705436638acc7c010349a69c3395f1a57c642dc62Ying Wang [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ 10805436638acc7c010349a69c3395f1a57c642dc62Ying Wang #include <stdlib.h> 10905436638acc7c010349a69c3395f1a57c642dc62Ying Wang #include <errno.h> 11005436638acc7c010349a69c3395f1a57c642dc62Ying Wang extern char **environ; 11105436638acc7c010349a69c3395f1a57c642dc62Ying Wang ]], [[ 11205436638acc7c010349a69c3395f1a57c642dc62Ying Wang char entry1[] = "a=1"; 11305436638acc7c010349a69c3395f1a57c642dc62Ying Wang char entry2[] = "b=2"; 11405436638acc7c010349a69c3395f1a57c642dc62Ying Wang char *env[] = { entry1, entry2, NULL }; 11505436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (putenv ((char *) "a=1")) return 1; 11605436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (putenv (entry2)) return 2; 11705436638acc7c010349a69c3395f1a57c642dc62Ying Wang entry2[0] = 'a'; 11805436638acc7c010349a69c3395f1a57c642dc62Ying Wang unsetenv ("a"); 11905436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (getenv ("a")) return 3; 12005436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (!unsetenv ("") || errno != EINVAL) return 4; 12105436638acc7c010349a69c3395f1a57c642dc62Ying Wang entry2[0] = 'b'; 12205436638acc7c010349a69c3395f1a57c642dc62Ying Wang environ = env; 12305436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (!getenv ("a")) return 5; 12405436638acc7c010349a69c3395f1a57c642dc62Ying Wang entry2[0] = 'a'; 12505436638acc7c010349a69c3395f1a57c642dc62Ying Wang unsetenv ("a"); 12605436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (getenv ("a")) return 6; 12705436638acc7c010349a69c3395f1a57c642dc62Ying Wang ]])], 12805436638acc7c010349a69c3395f1a57c642dc62Ying Wang [gl_cv_func_unsetenv_works=yes], [gl_cv_func_unsetenv_works=no], 12905436638acc7c010349a69c3395f1a57c642dc62Ying Wang [case "$host_os" in 13005436638acc7c010349a69c3395f1a57c642dc62Ying Wang # Guess yes on glibc systems. 13105436638acc7c010349a69c3395f1a57c642dc62Ying Wang *-gnu*) gl_cv_func_unsetenv_works="guessing yes" ;; 13205436638acc7c010349a69c3395f1a57c642dc62Ying Wang # If we don't know, assume the worst. 13305436638acc7c010349a69c3395f1a57c642dc62Ying Wang *) gl_cv_func_unsetenv_works="guessing no" ;; 13405436638acc7c010349a69c3395f1a57c642dc62Ying Wang esac 13505436638acc7c010349a69c3395f1a57c642dc62Ying Wang ])]) 13605436638acc7c010349a69c3395f1a57c642dc62Ying Wang case "$gl_cv_func_unsetenv_works" in 13705436638acc7c010349a69c3395f1a57c642dc62Ying Wang *yes) ;; 13805436638acc7c010349a69c3395f1a57c642dc62Ying Wang *) 13905436638acc7c010349a69c3395f1a57c642dc62Ying Wang REPLACE_UNSETENV=1 14005436638acc7c010349a69c3395f1a57c642dc62Ying Wang ;; 14105436638acc7c010349a69c3395f1a57c642dc62Ying Wang esac 14205436638acc7c010349a69c3395f1a57c642dc62Ying Wang fi 14305436638acc7c010349a69c3395f1a57c642dc62Ying Wang]) 14405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 14505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# Prerequisites of lib/setenv.c. 14605436638acc7c010349a69c3395f1a57c642dc62Ying WangAC_DEFUN([gl_PREREQ_SETENV], 14705436638acc7c010349a69c3395f1a57c642dc62Ying Wang[ 14805436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([AC_FUNC_ALLOCA]) 14905436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([gl_ENVIRON]) 15005436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_HEADERS_ONCE([unistd.h]) 15105436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_HEADERS([search.h]) 15205436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_FUNCS([tsearch]) 15305436638acc7c010349a69c3395f1a57c642dc62Ying Wang]) 15405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 15505436638acc7c010349a69c3395f1a57c642dc62Ying Wang# Prerequisites of lib/unsetenv.c. 15605436638acc7c010349a69c3395f1a57c642dc62Ying WangAC_DEFUN([gl_PREREQ_UNSETENV], 15705436638acc7c010349a69c3395f1a57c642dc62Ying Wang[ 15805436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_REQUIRE([gl_ENVIRON]) 15905436638acc7c010349a69c3395f1a57c642dc62Ying Wang AC_CHECK_HEADERS_ONCE([unistd.h]) 16005436638acc7c010349a69c3395f1a57c642dc62Ying Wang]) 161